Hello All,
I want to use a Arduino Mega with 20 induction PNP sensors. Some of the cable lengths for the sensors could be around 14 ft. Sensor voltage drop Max. 2.5 VDC @ 200 mA.
Hooking up a couple of sensors with resistors in series and a zener diode I am getting a voltage of 4.23V on
the input pin.
Just wanted to know if there any thing i should watch out for. I am currently getting a floating value on a digital read.
thoughts??
gxmark:
thoughts?
What are these sensors? Web link please.
Diagram of your circuit.
What sort of cable?
I am currently getting a floating value on a digital read.
that is a rather slippery concept. is it floating between 1 & 0?
Hi,
Welcome to the forum.
Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html .
Then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
We need to see your code.
What voltage are you powering your sensors?
Do they share the same gnd as the Mega?
Thanks.. Tom... 
As I said:
Paul__B:
What are these sensors? Web link please.Diagram of your circuit.
What sort of cable?
It's well over 24 hours since the OP.
The input may need a pull up or pull down resistor to make it stable
sureview:
The input may need a pull up or pull down resistor to make it stable
It is now five days since the OP.
No actual information has been forthcoming. It is most likely a dead thread. 